As an alternative while waiting on Epic, have you tried compiling from source code (epic/promoted or epic/master branches)?
Both branches will compile and run (as of this writing). I generally run epic/master but since I do not develop anything critical it’s not a big deal if it gets broken. 
You could try epic/promoted as that is the branch used internally by Epic’s artists and designers. It has some QA testing done on it but not release ready.
I do not suggest you run this in production, only to check if your issues have been resolved upstream.
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